You have to buy a training manual first, there are three tiers of them. Level 10 (or 11?), Level 40, and Level 60. The lowest one costs 10 silver, though is usually cheaper on the TP. The next is … um … 1 gold? Though I think it’s 1 gold for the top one?
Anyway, you buy a manual, use it, and then you can spend your points. When you use the next tier manual it wipes out all you’ve spent, so make a note of what you had if you want to keep the same setup (you just reapply all the points gained). You can’t get to the second and third sets of traits until you use the manuals.
*edit — buy them from your profession trainer. They have a book over their head. In LA they are near the Forge.
